RU1803307C - Belt-grinding machine - Google Patents

Abstract

Usage: the belt grinding machine is designed to process the surface of thin metal strips and can be used in metallurgical plants or in the plants for their grinding. The inventive belt grinding machine is made in the form of a tape drive mechanism mounted on the frame with a guide element in the form of a set of rollers, equipped with an element for clamping the processing product to an abrasive belt having a flexible axis, and cantilever sections of this axis are arranged to interact with power elements . The guide elements are mounted on a flexible axis with the possibility of axial movement relative to it. The width of the rollers of the set located at the edge exceeds the width of the rollers located in the middle, and each of the rollers in the section with an axial plane has the shape of an I-beam. The guide member has a concave profile. Positive effect: metal removal during grinding is reduced by 1.5: 3.0 times, the surface quality of the workpiece is improved. 2 s.p. f-ly, 4 ill.

Description

The invention relates to the field of rolled production and can be used in enterprises of ferrous and non-ferrous metallurgy.

The purpose of the invention is to improve the quality of processing.

This goal is achieved in that the belt grinding machine, made in the form of a tape drive mechanism mounted on the frame with a guide element in the form of a set of rollers and located opposite to their element of clamping the workpiece to the abrasive belt, is equipped with a flexible axis, and cantilever sections this axis is placed with the possibility of interaction with the power elements provided in the machine, while the guide elements are mounted on a flexible axis with the possibility of axial movement of the node is rotated (Associated with the security elements to the bending axis, e.g., hydraulic cylinders.

To facilitate mutual displacement along the ends of the disks when the axis is bent, the width of the disks decreases towards the middle of the guide roller, and the disks themselves are in the form of an I-beam in cross section.

To fix the strip in the axial direction and reduce the axis deflection when adjusting the profile of the guide roller, the set of discs forming its barrel has a concave profile.

It is known that as a result of roll bending during rolling, the transverse settlement of the rolled strips has a biconvex (lenticular) profile, described

00

about

CA W O

parabolic addiction. When grinding a strip between a cylindrical guide roller, an endless belt and a cylindrical support roller, their profile and the profile of the strip do not coincide. This leads to a partial removal of metal along the apex of the convex profile and low quality surface treatment. To improve the surface finish of the strip, the profile of the clamping element of the workpiece to be machined should correspond to the profile of the strip with a concave arrow

fЈ 5h1y. (1)

where f 2 is the total concavity arrow of the parabolic outer generatrix of the rollers;

ZYU - cross-sectional thickness of the strip.

If the rollers of the preload element are profiled concave parabolic with the concavity arrow according to expression (1), the anisotropy of the strip surface will be improved.

For a wider assortment of strips of various widths and thicknesses, from different grades of steel and alloys rolled on cold rolling mills, the transverse thickness variation can vary from 0.01 mm to 0.1 mm.

When grinding strips with different transverse thickness variations, the concavity arrow of the rollers of the preload member of the workpiece also varies from 0.01 to 0.1 mm. In order to center the strip along the grinding axis, the barrel of the support roller is profiled concave with an arrow of 0.01 mm.

The concave boom of the support roller is constant, and the guide roller and the sanding belt covering it are changed by bending its axis by means of sliding bearings and hydraulic cylinder rods connected to it.

When bending the axis of the guide roller and profiling the boom of the support roller, the total concavity arrow is

.p. + fo.p.№ where fH.o. and f0.p. - the concavity arrow of the guide and support rollers.

Fig. 1 is a view along the grinding line of a strip; figure 2 - with a partial section in the transverse direction of the belt grinding machine; Fig. 3 is a cross-sectional view of a guide roller; in FIG. 4 is a lenticular strip profile using forces P exerted by the hydraulic cylinders through the rotation units of the guide roller.

The belt grinding machine (Fig. 1,2) consists of a tape drive mechanism including a guide roller 1, a drive drum 2, a support roller 3,

tension roller 4, endless tape 5, the clamping element of the workpiece to be processed consists of power elements of single-cavity hydraulic cylinders 6, strip 7, stationary 8 and rotating 9 bearings

guide roller 1.

In turn, the guide roller 1 (Fig. 2, 3) is made in the form of a two-support flexible axis with the disks 10 mutually movable along the ends of the disks 10 mounted between the stationary supports 8, for example, by means of a movable key connection; the length of the set of disks forming the barrel of the guide roller exceeds the width of the grinding strip, the set

0 disks are fixed from axial displacement along the ends, for example, by means of nuts 11, and the axis shafts protruding from the stationary supports 8 are pivotally connected by means of a rotation unit 9 to the device for

5 axis bending, for example, single-cavity hydraulic cylinders 6.

Belt grinding machine operates as follows.

The strip 7 (Fig. 1,2) is defined between the support roller 3 and the guide roller 1, tension is applied to the coiler 12 and the scraper 13, the rotation belt is turned on, the strip 7 is driven by the difference in tension

5 winders 12 and unwinder 13. Grinding is carried out using an endless sanding belt 5 made of rubber and coated with an abrasive compound - aluminum oxide or silicon carbide.

0 The aim of the invention is achieved by giving the forming guide roller 1 a profile corresponding to the profile of the grinding strip 7, by applying through the support of rotation

5 to 9 of the guide roller 1 of the force P generated by the single-cavity hydraulic cylinders 6 (according to Fig. 4, the force P is applied to the guide roller through the lower hydraulic cylinders). The support roll 3 is then concave in order to center the sanding belt 5 and strip 7 relative to the longitudinal axis. This concavity may be less than, equal to or greater than the profile

5 sanding strips.

In order to facilitate mutual displacement along the ends of the disks 10 when the axis 14 is bent (Fig. 3), the width of the disks decreases towards the middle of the guide roller 1, and the cross section disks R themselves are in the form of an I-beam.

To reduce the deflection of the axis 14 (Fig. 3) and to fix the strip in the axial direction when adjusting the profile of the guide roller 1, the set of discs 10 of Figure 2, forming its barrel, has a pre-concave profile.

When sanding a strip according to the invention, the sanding belt 5 (Fig. 1.2) uniformly fits the embossed strip 7 to the entire contact surface, which guarantees an improvement in the surface quality of the sanding strip.

The required bending force P is calculated by the formula 4 E 1X fn n.

Id2 (3) where a is the center-to-center distance between the stationary pillows 8 of the guide roller 1 (Fig. 2), mm;

: I - distance from the center of the support 8 to the place of application of force P, mm; ; E - modulus of elasticity, kg / mm2;

for steel E 21000 kg / mm;

Ix — moment of inertia of the cross section (FIG. 3), mm;

fH is the deflection of the guide roller corresponding to the profile of the grinding strip cii. mm

P rmm e r. Grinding of a strip with a width of 505 mm and a thickness of 2 mm from 42N alloy was performed on the Comek aggregate. The diameter of the drum is 500 mm, the diameter of the guide and support rollers is 200 mm, and the barrel length is 800 mm.

The bending force P, the concavity arrow of the guide roller with an axis diameter of 55 mm, the outer and inner diameters of the disks KQB 200 mm and 180 mm, length 865 mm, the distance between the bending forces 1330 a + 21-pf f-le (3), the distance between the supports (a) 900 mm, as well as the concave boom of the support roller f0, are presented in Table 1.

From table 1 it follows that if the arrow of concavity of the support roller is equal to 0.01 mm, and by bending the axis of the guide roller, the arrow of concavity of its bandage varies from 0 to 0.075 mm, then the total arrow of concavity of the rollers is f-and equal to its transverse thickness the strip varies from 0.01 to 0.085 mm, and the bending force P varies from 0 to 57.20 KN.

Table 2 shows examples of grinding bands of 42 N alloy, 505 mm wide, from 2.085 mm to 1.86 thick on the Comek assembly.

The processing of the strips with the P9 sanding belt was carried out in two ways:

1) according to the prototype, in cylindrical rollers with a diameter of 200 mm;

2) on the proposed belt grinding machine, the diameter of the guide roller is 200 mm;

a) the concave arrow of the guide roller fH 0.05 mm, the concave arrow of the support roller fo 0.01 mm.

b) fH 0.075 mm, f0 0.01 mm.

The removal area of the grinded metal was determined based on geometric calculations of the strip section,

From table 2 it follows that when grinding strips of alloy 42H with a width of 505 mm in profiled rollers we remove metal from 1 running meter, compared with grinding by the prototype, it decreases by 3.04 times with fz 0.06 mm, and when f Ј 0.085 mm - 1.82 times, the quality of the strip is improved.

Claims (3)

1. A belt grinding machine made in the form of a tape drive mechanism mounted on the bed with a guide element in the form of a set of rollers and an element for pressing the workpiece to abrasive belt located opposite to them, which is necessary in order to improve the quality of processing , the machine is equipped with a flexible axis, cantilever sections of which are placed with the possibility of interaction with the power elements provided in the machine, while the guide elements are mounted on a flexible axis with the possibility axial displacement relative to her. 2. The machine according to claim 1, characterized in that the width of the set rollers located at the edge exceeds the width of the role-krv located in the middle, and each of the rollers in the section with an axial plane has the shape of an I-beam. 3. Machine according to claim 1, characterized in that the guide element has a concave profile. Table 1 Fi9.1 Table 1 loach) 81 Fig.Z